I have a 2004 T&C 3.8L with 43,000 miles. I have noticed what I think
> feels like a miss in the vehicle ever since I bought it in March of
> 2004. It is most noticable when I am at about 55mph and hit the
> resume on the cruise to go back to 70-75. You can certainly feel what
> seems to be a miss, I have replaced in the last 10,000 miles, plugs
> and wires with no change. Ever now and then in the morning when I
> start it up, it will idle rough for a couple of seconds or when I am
> at a stop light it will miss. For the most part the vehicle runs
> great (I am 95% highway miles) and I can only feel the miss when I am
> accelerating. Maybe it is something in the transmission? I don't > know, any thoughts?
>
Have you given the engine the lookover to make sure there's no disconnected vacuum lines?
Do you have emission testing in your state and does it pass emissions?
Is it losing coolant?
Could be a sticky EGR valve, that is just a guess.
I would check fuel pressure for starters, and get the vehicle computer scanned by a dealer. Another cheap shotgun thing you can try doing is changing the fuel filter, if this has an external can-style filter but that probably won't work.
I would also recommend you get right on this problem since if it is a fuel problem you can burn up your catalytic converter of you let it go for a long period of time. My gut feel is your dealing with a fuel mixture issue not an ignition issue.
Ted